توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Langley, K. M. (1976). A note on the economics of the international petroleum industry and the economy of the Philippines [microform]. Photoduplication Service, University of the Philippines Library.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Langley, Kathleen M. A Note on the Economics of the International Petroleum Industry and the Economy of the Philippines [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1976.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

Langley, Kathleen M. A Note on the Economics of the International Petroleum Industry and the Economy of the Philippines [microform]. Photoduplication Service, University of the Philippines Library, 1976.